scholarly journals The Far Ultraviolet Background: Dust Scattering and the Extragalactic Continuum

1990 ◽  
Vol 139 ◽  
pp. 229-230
Author(s):  
Mark Hurwitz ◽  
Stuart Bowyer ◽  
Christopher Martin
Keyword(s):  
Wavelength Range ◽  
Space Shuttle ◽  
Neutral Hydrogen ◽  
University Of California ◽  
Full Description ◽  
Wide Range ◽  
Far Ultraviolet ◽  
The University

NASA's Ultraviolet Experiment (UVX) payload, which flew aboard space shuttle Columbia in January 1986, contained a spectrograph built by the Space Astrophysics Group at the University of California, Berkeley. The wavelength range is 1400–1850 Å with a FWHM resolution of ~15 ± 2 Å. A full description of the instrument can be found in Martin and Bowyer (1984). The instrument was pointed at various regions of the sky for 8 nighttime orbits. Targets spanning a wide range of galactic latitudes and neutral hydrogen column densities were observed.

scholarly journals BEAR-FP: A ROBUST FRAMEWORK FOR FLOORPLANNING

1992 ◽  
Vol 03 (01) ◽  
pp. 137-170 ◽  
Author(s):  
MASSOUD PEDRAM ◽  
ERNEST S. KUH
Keyword(s):  
Shape Function ◽  
Optimization Procedure ◽  
University Of California ◽  
Global Routing ◽  
Top Down ◽  
Function Computation ◽  
Wide Range ◽  
The University ◽  
Linear Assignment ◽  
Selection Of

This paper presents a hierarchical floorplanning approach for macrocell layouts which is based on the bottom-up clustering, shape function computation, and top-down floorplan optimization with integrated global routing and pin assignment. This approach provides means for specifying and techniques for satisfying a wide range of constraints (physical, topological, timing) and is, therefore, able to generate floorplans for a number of different layout styles. A systematic and efficient optimization procedure during the selection of suitable floorplan patterns that integrates floorplanning, global routing and pin assignment, a new pin assignment technique based on linear assignment and driven by the global routing solution and floorplan topology, and an effective timing-driven floorplanning scheme are among the other novel features of the floorplanner. These techniques have been incorporated in BEAR-FP, a macrocell layout system developed at the University of California, Berkeley. Results on various placement and floorplanning benchmarks are quite good.

scholarly journals OUTSIDE THE MAINSTREAM: AN INTERVIEW WITH AXEL LEIJONHUFVUD

2004 ◽  
Vol 8 (1) ◽  
pp. 117-145 ◽  
Author(s):  
BRIAN SNOWDON
Keyword(s):  
Los Angeles ◽  
Business Cycles ◽  
Monetary Economics ◽  
University Of California ◽  
Professor Emeritus ◽  
Coordination Failure ◽  
Classical Equilibrium ◽  
Wide Range ◽  
Famous Book ◽  
The University

Axel Leijonhufvud made an enormous impact on macroeconomics in the late 1960s with the publication of his bookOn Keynesian Economics and the Economics of Keynes: A Study of Monetary Economics(1968). In this famous book, Leijonhufvud argued that the standard neoclassical synthesis (Hicks–Hansen IS-LM) interpretation of the General Theory totally misunderstood and misinterpreted Keynes. However, during the 1970's, interest in Keynes and Keynesian models waned as new classical equilibrium models became all the rage. Nevertheless, Leijonhufvud, from a position outside the mainstream, continued his research into problems of unemployment, business cycles, and inflation—issues that from his perspective are problems of coordination failure in complex dynamical systems. Axel Leijonhufvud is currently Professor Emeritus at the University of California, Los Angeles, and, since 1995, Professor of Monetary Economics at the University of Trento, Italy. In this interview the author discusses with Leijonhufvud a wide range of issues relating to his own work as well as his views on the development of macroeconomics after Keynes.

scholarly journals ORFEUS observation of the central star of NGC 6543

1997 ◽  
Vol 180 ◽  
pp. 136-136
Author(s):  
J. Zweigle ◽  
M. Grewing ◽  
J. Barnstedt ◽  
M. Gölz ◽  
W. Gringel ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Planetary Nebula ◽  
Extreme Ultraviolet ◽  
Wavelength Region ◽  
Central Star ◽  
University Of California ◽  
Satellite Mission ◽  
Ultraviolet Spectrometer ◽  
Far Ultraviolet ◽  
The University

During the ORFEUS-SPAS (Orbiting Retrievable Far and Extreme Ultraviolet Spectrometer on the Shuttle Pallet Satellite) mission STS-51, flown in September 1993, we observed the central star of the planetary nebula NGC 6543 in the far ultraviolet (90 nm to 115 nm) wavelength region using the University of California, Berkeley spectrometer with a spectral resolution of 0.03 nm.

scholarly journals Geffen Faculty Highlight Concerns Linking CAIM and Conventional Researchers at UCLA Symposium

2010 ◽  
Vol 7 (1) ◽  
pp. 29-32
Author(s):  
Elizabeth H. Logue
Keyword(s):  
Los Angeles ◽  
Integrative Medicine ◽  
Cross Talk ◽  
University Of California ◽  
Institutional Review Board ◽  
Research Subjects ◽  
School Of Medicine ◽  
Institutional Review ◽  
Wide Range ◽  
The University

David Geffen School of Medicine faculty, representing a wide range of disciplines, engaged speakers nationally known for their expertise on complementary, alternative and integrative medicine (CAIM) and its investigation at a January, 2008 symposium on the campus of the University of California, Los Angeles. The forum was created to educate the UCLA Institutional Review Board (IRB), and lively participation by School of Medicine faculty helped bring IRB members up to speed on controversies surrounding CAIM research. The symposium demonstrated that academics who are neither proponents nor detractors of CAIM can facilitate cross talk between opposing camps, elucidating questions important to its evaluation by those charged with protecting research subjects. It also brought attention to the universality of quandaries facing CAIM investigators and to the ingenuity with which they have addressed many of them.

scholarly journals The Galactic Far Ultraviolet Background

1990 ◽  
Vol 139 ◽  
pp. 171-183 ◽  
Author(s):  
Stuart Bowyer
Keyword(s):  
Galactic Plane ◽  
Strong Support ◽  
Neutral Hydrogen ◽  
Hydrogen Column Density ◽  
Wide Range ◽  
The Galaxy ◽  
Major Turning Point ◽  
Scattering Phase ◽  
Far Ultraviolet ◽  
Phase Functions

Measurements of the far ultraviolet background are reviewed. A major turning point occurred in the study of this field in the early 1980s, when evidence was first presented that this flux was primarily galactic in origin rather than extragalactic, as had been generally believed. A number of experiments have confirmed this result, and it has been established that the flux is the result of scattering of starlight by dust. However, the detailed scattering properties of dust in the far ultraviolet are uncertain; a wide range of albedos and scattering phase functions have been reported. Very recent evidence indicates that ultraviolet scattering grains are different from grains that scatter in the visible in that they have a low albedo and scatter isotropically. There is evidence that this dust is present at some level in all view directions in the galaxy. Spectral emission features have been detected recently in the diffuse background. Lines of C IV and O III] have been observed and lines of O IV/Si IV and N III have probably been observed. It has been established that the 105 K gas producing these lines is 2–3 kpc above the galactic plane. Overall mass flux rates of 5 to 25 M⊙ yr−1 for this gas are indicated, which provides strong support for the galactic fountain model for this material. Emission from molecular hydrogen has been detected in directions of high and low neutral hydrogen column density. This emission emanates from low density molecular clouds and indicates clumping of the emitting material in the clouds. Our knowledge of the sources of the far ultraviolet background has increased dramatically in the past 10 years. The results obtained have yielded surprising new insights on a variety of astrophysical topics.

scholarly journals Far Ultraviolet Observations of Dwarf Novae made with the Hopkins Ultraviolet Telescope

1996 ◽  
Vol 158 ◽  
pp. 233-241
Author(s):  
Knox S. Long
Keyword(s):  
Steady State ◽  
Wavelength Range ◽  
White Dwarf ◽  
Space Shuttle ◽  
Higher Order ◽  
Stellar Model ◽  
Dwarf Novae ◽  
Far Ultraviolet ◽  
Ultraviolet Observations

AbstractObservations with the Hopkins Ultraviolet Telescope on the Astro-1 and Astro-2 space shuttle missions have provided the first set of moderate (3 Å) resolution far ultraviolet (FUV) spectra of dwarf novae to include the wavelength range between Lyα and the Lyman limit. Important lines which are detected in the HUT spectra of dwarf novae in this wavelength range include S VI λλ933,945, C III λ977, O VI λλ1032,1038, P V λλ1118,1128 and C III λ1176, as well as the higher order Lyman lines. The observations confirm earlier IUE observations that two dwarf novae – U Gem and VW Hyi – have quiescent FUV spectra dominated by the white dwarf, but suggest that the quiescent FUV emission from three other dwarf novae – SS Cyg, WX Hyi and YZ Cnc – are dominated by emission from a hot portion of the disk or a disk corona. The spectra obtained of the dwarf novae Z Cam and EM Cyg in outburst and also of the nova-like variable IX Vel can be modeled reasonably successfully in terms of steady state disks constructed by adding appropriately-weighted stellar model spectra.

TEM study of boron additions to cobalt aluminide

1988 ◽  
Vol 46 ◽  
pp. 546-547
Author(s):  
Gerald B. Feldewerth
Keyword(s):  
High Temperature ◽  
Turbine Engines ◽  
Major Drawback ◽  
University Of Missouri ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Wide Range ◽  
Ordered Alloys ◽  
The University ◽  
Very High

In recent years an increasing emphasis has been placed on the study of high temperature intermetallic compounds for possible aerospace applications. One group of interest is the B2 aiuminides. This group of intermetaliics has a very high melting temperature, good high temperature, and excellent specific strength. These qualities make it a candidate for applications such as turbine engines. The B2 aiuminides exist over a wide range of compositions and also have a large solubility for third element substitutional additions, which may allow alloying additions to overcome their major drawback, their brittle nature.One B2 aluminide currently being studied is cobalt aluminide. Optical microscopy of CoAl alloys produced at the University of Missouri-Rolla showed a dramatic decrease in the grain size which affects the yield strength and flow stress of long range ordered alloys, and a change in the grain shape with the addition of 0.5 % boron.

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